This is the standard manspring used for all adjustable bolt system configurations (9mm, 45ACP, & 7.62 x 25). It is specially designed for maximum reliability across a wide variety of cartridge characteristics...

STG Universal quad rail barrel shroud for 10", 10.35" and 16" barrels:
The bottom rail in machined into the shroud. 1 accessory is included. Accessory rails can be attached to the top, left and right of...